If you like techno, acid, house or dance music, then RubberDuck is the virtual instrument you'll need. Its design incorporates the Roland TB-303 synthesizer .
It can simulates most of the bass sounds. It has two oscillators, 4 waveforms, resonant filters and settings for the volume and frequency. You can program up to 224 notes in the sequencer that can sync with drum samples and effects (distortion). It'll just download the software to try to test your creativity.